Johnnie Aysgarth is a handsome gambler who seems to live by borrowing money from friends. He meets sheltered Lina McLaidlaw on a train whilst trying to travel in a first class carriage with a third class ticket. Only after they are married does Lina begin to discover his true character.

Major Vickers is an officer at the 27th Lancers in India 1856. When the regiment is on maneuver, the barracks are attacked by Surat Khan and his soldiers who massacre British women and children. This leaves an inextinguishable memory and Vickers promises to revenge the dead.

When the fabled Star of Rhodesia diamond is stolen on a London to Edinburgh train and the son of its owner is murdered, Sherlock Holmes must discover which of his suspicious fellow passengers is responsible.

Sherlock Holmes investigates when young women around London turn up murdered, each with a finger severed off. Scotland Yard suspects a madman, but Holmes believes the killings to be part of a diabolical plot.

During WWII several murders occur at a convalescent home where Dr. Watson has volunteered his services. He summons Holmes for help and the master detective proceeds to solve the crime from a long list of suspects including the owners of the home, the staff and the patients recovering there.

England, at the start of World War Two. Mysterious wireless broadcasts, apparently from Nazi Germany are heard over the BBC. The warn of acts of terror in England, just before they take place. Baffled, the Defence Committee call in Holmes…